There was an abandoned change that made reference to a RecussionError
when running a probe test that imported boto3 that had something to do
with eventlet, ssl and a transitive dependency on requests-mock, but the
fix that actually got merged seemed to depend on another change to
tox.ini that disables request-mock when we run pytest.
Either way, we already import from boto3 at the top of probe tests and
it's in test-requirements; so we require it to be installed even if you
don't have s3api in your pipeline.
Related-Change: I789b257635c031ac0cb6e4b5980f741e0cb5244d
Related-Change: I2793e335a08ad373c49cbbe6759d4e97cc420867
Related-Change: If14e4d2c1af2efcbc99e9b6fe10973a7eb94d589
Change-Id: Id2662bfc5ef2f21f901f1c98e6389c4cb01818a2
a666010aae